Feed device for roller-mills for grinding grain



'W. D. GRAY. Feed Device forlRoller Mills for Grinding Grain. No. 235,761. 1 ,Patented Dec. 2 1, 1880 III.

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UNITED STATES PATENT OFFICE.

WILLIAMID. GRAY, OF MILWAUKEE, WISCONSIN.

FEED DEVICE FOR ROLLER-MILLS FOR GRINDING GRAIN.

SPECIFICATION forming part of Letters Patent No. 235,761, dated December 21, 1880. Application filed February 16, 1880.

To all whom it may concern:

Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to roller grinding-mills;

and it consists in providing means whereby the feed-regulatin g gates may be adjusted from either side of the hopper, and whereby two or more such gates may be operated simultaneously. V

The invention further consists in a peculiar construction of devices for carrying my im- I 5 provements into practice, as hereinafter more fully explained.

In the drawings, Figure 1 represents a longitudinal vertical section of a double hopper provided with my improved feed-regulating 2Q device 5 Fig. 2, a cross-section of the same on the line 3 y of Fig. 1, and Fig. 3 an outside elevation of the hopper. I p

In the practical use of roller grinding-mills it is found necessary to close the feed-regulating gates frequently and quickly, and, in the case of such mills containing two or more pairs of rolls, to close the gates of the different rolls all at the same instant, in order that the operation of all the pairs shall be the same. To

accomplish these objects I provide the feed- Q cheap,and durable. This consists, essentially,

of a horizontal shaft extending through the hopper and provided at its outer ends, outside of the hopper, with handles or arms, by which to rotate it in its bearings, said shaft being furnished with one or more eccentric disks, each arranged to work between two inwardly-projectin g studs on an upright guiding- .arm of a feed-regulating or cut-off gate, and serving, when the shaft is rotated, to "raise or Referring now to the drawings, A represents a double hopper, made in the form of the letter W, with two months or openings, at, through which the material is delivered to the respective rolls.

0 0 represent the feed regulating or stop gates, mounted on the inner sides of the hopper, above the rolls, and adapted to slide down freely and entirely close the feed-openings. These gates O are each guided and held in place by a central upright arm, 01, mounted in guides on the face of the hopper. Each gate arm is provided with two studs, 6, which extend horizontally inward to embrace an eccentric, D. The two eccentrics D are mounted on a shaft, E, which is extended across the hopper and through its sides and provided with handles H at the two ends. The attendant, by moving either handle, can turn theshaft and both eccentrics, and cause the latter to open or close both gates 0 simultaneously and instantly. The same arrangement ofthe gates and operating devices may, of course, be used in a machine having a single hopper and only one pair of rolls; or the shaft maybe extended through a series of hoppers to operate the gate or gates of each.

In the drawings I have shown outside feedregulating gates, B, provided with adjustingserews b, the object of which gates is to regulate the rate of 'feedin g, while the gates G serve merely to open or close the throats a, for starting or stopping the feeding. These outer gates, however, constitute no part of the present invention, but are embraced in a separate application filed by me. They may be omitted entirely, in which case the gates G will serve both as regulating and stop gates.

Having thus described my invention, what I claim is l 1. In a roller grinding-mill, a feed-regulating gate and devices,substantially as shown, for operating the same, extended on both sides of the machine, whereby the attendant is enabled to stop the feed instantly, in case of necessity, from either side of the machine.

2. The combination of the hopper, the two internal gates, located on opposite sides, and the single shaft provided with the two eccentrics acting upon the respective gates, as shown.

WILLIAM D. GRAY.

Witnesses:

J. A. BEcHER, R. BIRKHoLz. 

